Being charged $100 for returned router

My account says I will be charged $100 on August 12th for a router I've already returned.  The UPS tracking number reports that the router was successfully delivered on April 22nd - yet I am still receiving emails telling me I need to return my equipment. 

Re: Being charged $100 for returned router

Hi TK3,

Your issue has been escalated to a Verizon agent. Please check your Private Messenger Inbox for a message from a Verizon Support agent. You can find your Inbox by clicking on your username at the top right corner of this page and then clicking the envelope icon that appears at the top of the menu. Response times may vary and may be delayed at this time. Please continue to check your Inbox for a reply from a Verizon agent. Please direct all correspondence concerning your issue to the agents who will be assisting you privately.